反应详情

To a solution of 2-methoxyethyl 4-methoxy-5-(2-methoxyethoxy)-2-nitrobenzoate (5.0 g, 15.2 mmol) in EtOH (40 mL) was added 2N NaOH (40 mL, 76.0 mmol, 5 eq.). The mixture was stirred at RT for 12 h. The mixture was diluted with water (100 mL) and washed with CH2Cl2 (1×100 mL). The aqueous layer was acidified to pH=1 using 1N HCl (A solid began to precipitate, this was dissolved by the addition of EtOAc). The aqueous mixture was extracted with EtOAc (2×200 mL). The combined organics were washed with brine (1×100 mL), dried (Na2SO4), filtered and concentrated in vacuo to give 4-methoxy-5-(2-methoxyethoxy)-2-nitrobenzoic acid as an off white solid (3.55 g, 12.4 mmol, 86%). HPLC retention time 4.94 mins.

1. washwashed with CH2Cl2 (1×100 mL)
2. customto precipitate
3. dissolutionthis was dissolved by the addition of EtOAc)
4. extractionThe aqueous mixture was extracted with EtOAc (2×200 mL)
5. washThe combined organics were washed with brine (1×100 mL)
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo